Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/2711#discussion_r19492748
--- Diff:
yarn/common/src/main/scala/org/apache/spark/deploy/yarn/ClientBase.scala ---
@@ -307,10 +308,9 @@ private[spark] trait ClientBase extends Logging {
val localResources = prepareLocalResources(appStagingDir)
val launchEnv = setupLaunchEnv(appStagingDir)
val amContainer = Records.newRecord(classOf[ContainerLaunchContext])
- amContainer.setLocalResources(localResources)
- amContainer.setEnvironment(launchEnv)
val javaOpts = ListBuffer[String]()
+ val prefixEnv = ListBuffer[String]()
--- End diff --
It seems that `prefixEnv` will always be a list with 1 element. Let's just
make it a string, then down there in L390 we can do
```
val commands = Seq(prefixEnv) ++ Seq(...)
```
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